How to add color and size in product detail page

Hello,

First you need to create a variable product. You can refer to the following instructions: https://docs.woocommerce.com/document/variable-product/ When Import Demo Content we also created variable products you can refer to Black Fashion Handbag products

After creating the Variable product you load the page and click Wooswatches -> select Option Custom Color or Image Swatches and Save